| Term | Definition |
| bibliomania | The passion for collecting books. |
| bibliography | A list of the words of an author, or the literature bearing on a particular subject. |
| bibliophile | One who loves books. |
| bibulous | Fond of drinking. |
| bide | To await. |
| biennial | A plant that produces leaves and roots the first year and flowers and fruit the second. |
| bier | A horizontal framework with two handles at each end for carrying a corpse to the grave. |
| bigamist | One who has two spouses at the same time. |
| bigamy | The crime of marrying any other person while having a legal spouse living. |
| bight | A slightly receding bay between headlands, formed by a long curve of a coast-line. |
| bilateral | Two-sided. |
| bilingual | Speaking two languages. |
| biograph | A bibliographical sketch or notice. |
| biography | A written account of one's life, actions, and character. |
| biology | The science of life or living organisms. |
| biped | An animal having two feet. |
| birthright | A privilege or possession into which one is born. |
| bitterness | Acridity, as to the taste. |
| blase | Sated with pleasure. |
| blaspheme | To indulge in profane oaths. |
| blatant | Noisily or offensively loud or clamorous. |
| blaze | A vivid glowing flame. |
| blazon | To make widely or generally known. |
| bleak | Desolate. |
| blemish | A mark that mars beauty. |
| blithe | Joyous. |
| blithesome | Cheerful. |
| blockade | The shutting up of a town, a frontier, or a line of coast by hostile forces. |
| boatswain | A subordinate officer of a vessel, who has general charge of the rigging, anchors, etc. |
| bodice | A women's ornamental corset-shaped laced waist. |
| bodily | Corporeal. |
| boisterous | Unchecked merriment or animal spirits. |
| bole | The trunk or body of a tree. |
| bolero | A Spanish dance, illustrative of the passion of love, accompanied by caste nets and singing. |
| boll | A round pod or seed-capsule, as a flax or cotton. |
| bolster | To support, as something wrong. |
| bomb | A hollow projectile containing an explosive material. |
| bombard | To assail with any missile or with abusive speech. |
| bombardier | A person who has charge of mortars, bombs, and shells. |
| bombast | Inflated or extravagant language, especially on unimportant subjects. |
| boorish | Rude. |
| bore | To weary by tediousness or dullness. |
| borough | An incorporated village or town. |
| bosom | The breast or the upper front of the thorax of a human being, especially of a woman. |
| botanical | Connected with the study or cultivation of plants. |
| botanize | To study plant-life. |
| botany | The science that treats of plants. |
| bountiful | Showing abundance. |
| Bowdlerize | To expurgate in editing (a literary composition) by omitting words or passages. |
| bowler | In cricket, the player who delivers the ball. |